package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
//实现接口方法
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /***
     *新增菜品和对应的口味
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();

        //进行属性拷贝
        BeanUtils.copyProperties(dishDTO,dish);

        //向菜品表插入一条数据
        dishMapper.insert(dish);

        //获取id
        Long id = dish.getId();

        //集合
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            //遍历赋值
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(id);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /***
     *菜品分页查询
     */

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开始分页
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page= dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Transactional//保证数据的一致性
    @Override
    public void deleteBatch(List<Long> ids) {
        /*
        判断当前菜品是否能够删除--是否存在起售中的菜品?
         */
        //因为参数是list集合需要进行遍历
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            //来判断菜品是否是停售(0)还是起售(1)
            //getStatus指当前对象状态的值
            if (dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品处于起售中(1),就不能够删除,直接抛异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        /*
        判断当前菜品是否能够删除--是否被套餐关联了?
         */
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        //判断
        if (setmealIds != null &&  setmealIds.size() >0 ){
            //当前菜品要是被套餐关联了,就不能删除直接抛出异常返回前端
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        /*
        删除菜品表中的菜品数据
         */
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
         /*
        删除菜品关联的口味数据
         */
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //根据菜品id集合批量删除菜品数据
        //sql: delete from dish where id in (?,?,?)
        dishMapper.deleteByIds(ids);

        //根据菜品id集合批量删除关联的口味
        //sql: delete from dish_flavor where dish_id in(?,?,?)
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id 查看菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查看口味数据
       List<DishFlavor>dishFlavors= dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到VO
       DishVO dishVO = new DishVO();
       //拷贝
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品基本信息和口味的信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        //拷贝
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            //遍历赋值
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品起售或停售
     * @param status
     * @param id
     */
    @Override
    public void statusOrStop(Integer status, Long id) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.update(dish);

        //判断菜品是起售(1)还是停售(0)
        if (status == StatusConstant.DISABLE){
            //如果为停售状态,就需要将包含当前菜品的套餐也要停售
            //创建一个集合
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);

            //select setmeal_id from setmeal_dish where dish_id in(?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            //判断
            if (setmealIds != null && setmealIds.size() > 0){
                //遍历
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder().id(setmealId).status(StatusConstant.DISABLE).build();
                    setmealDishMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        //设置id菜品的状态为起售
        Dish dish = Dish.builder().categoryId(categoryId).status(StatusConstant.ENABLE).build();
        //调用dishMapper对象的list方法，将之前创建的Dish对象当作参数传入，以此查询符合条件的菜品列表，最后返回该列表
        return dishMapper.list(dish);
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
